What had Micky shea done for Eddie's father?

Answers
1

Mickey had helped Eddie's father get a job, and had loaned him money when he was in need.

"But many years earlier, when your father was looking for work, it was Mickey who went to the pier owner and vouched for him. And when you were born, it was Mickey who lent your parents what little money he had, to help pay for the extra mouth to feed.Your father took old friendships seriously—"